I'm looking at what I am calling Digital Edition Solution Providers (ways of taking a PDF of a magazine and turning it into a website, and content for sale on Apple Newsstand, Android, KindleFire etc.), and trying to compare them.

But the term "Digital Edition Solution Provider" is one I came up with on my own because I didn't know what these things were called in general.

3 Answers
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The most generic name for things like the iTunes store and Android Market are "Digital Media Service" and "Digital Content Provider." There doesn't appear to be an exact consensus on a universal generic term for this.

For those which specialize in making content digital, the term "digitization" is also used, so you will come across "Digitization Services" for example, but these are usually distinct from things like iTunes.

Digital publishing platform fits, as in this sentence in a trade publication: "The launch of Apple's digital publishing platform iOS5 Newsstand signals a new focus and support for publishers taking their content to the iPad." From a library journal: "Bookriff, yet another digital publishing platform, will soon go live. Yet while it is entering a crowded field, this one is worth a close look as it has the potential to take hold."

The term also works for a service that moves content online. One company touts a "Self-Service Digital Publishing Platform" that permits a user to convert a PDF "add unique features and embed your publication on your website."